Your current coilover rates of 6Kg and 4kg equate to 336 lbs/in in the front and 224 lbs/in in the rear. By way of comparison: Tien H tech (Source:Tien data/CZP) Front Spring Rate - 3.3 kg/mm / 185 lbs/in Rear Spring Rate - 3.2 kg/mm / 179 lbs/in OEM TT Front: 168 lbs/in or 3.0 Kg/mm TT Rear: 134 lbs/in or 2.4 Kg/mm Eibach Spring Rates (Progressive Rates) TT Front: 182 lbs/in up to 251 lbs/in TT Rear: 142 lbs/in up to 199 lbs/in
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